Like the pictured, Chuck Liddell, some fighters don't know when to quit. Some of these guys are just at that point where the game is passing them by or they are just at that age where they should retire. Some even just have enough money to survive the rest of their life so why bother risking injury?
There are fighters all over like this, whether it be in Strikeforce, UFC or wherever, some fighters are just at that point.
Here are five fighters who should call it quits.